* TI OMAP I2C master mode driver
*
* Copyright (C) 2003 MontaVista Software, Inc.
- * Copyright (C) 2004 Texas Instruments.
- *
- * Updated to work with multiple I2C interfaces on 24xx by
- * Tony Lindgren <tony@atomide.com> and Imre Deak <imre.deak@nokia.com>
* Copyright (C) 2005 Nokia Corporation
+ * Copyright (C) 2004 - 2007 Texas Instruments.
*
- * Cleaned up by Juha Yrjölä <juha.yrjola@nokia.com>
+ * Originally written by MontaVista Software, Inc.
+ * Additional contributions by:
+ * Tony Lindgren <tony@atomide.com>
+ * Imre Deak <imre.deak@nokia.com>
+ * Juha Yrjölä <juha.yrjola@solidboot.com>
+ * Syed Khasim <x0khasim@ti.com>
+ * Nishant Menon <nm@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#include <linux/completion.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
+#include <linux/io.h>
+
+/* I2C controller revisions */
+#define OMAP_I2C_REV_2 0x20
-#include <asm/io.h>
+/* I2C controller revisions present on specific hardware */
+#define OMAP_I2C_REV_ON_2430 0x36
+#define OMAP_I2C_REV_ON_3430 0x3C
/* timeout waiting for the controller to respond */
#define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000))
#define OMAP_I2C_IE_REG 0x04
#define OMAP_I2C_STAT_REG 0x08
#define OMAP_I2C_IV_REG 0x0c
+/* For OMAP3 I2C_IV has changed to I2C_WE (wakeup enable) */
+#define OMAP_I2C_WE_REG 0x0c
#define OMAP_I2C_SYSS_REG 0x10
#define OMAP_I2C_BUF_REG 0x14
#define OMAP_I2C_CNT_REG 0x18
#define OMAP_I2C_STAT_NACK (1 << 1) /* No ack interrupt enable */
#define OMAP_I2C_STAT_AL (1 << 0) /* Arbitration lost int ena */
+/* I2C WE wakeup enable register */
+#define OMAP_I2C_WE_XDR_WE (1 << 14) /* TX drain wakup */
+#define OMAP_I2C_WE_RDR_WE (1 << 13) /* RX drain wakeup */
+#define OMAP_I2C_WE_AAS_WE (1 << 9) /* Address as slave wakeup*/
+#define OMAP_I2C_WE_BF_WE (1 << 8) /* Bus free wakeup */
+#define OMAP_I2C_WE_STC_WE (1 << 6) /* Start condition wakeup */
+#define OMAP_I2C_WE_GC_WE (1 << 5) /* General call wakeup */
+#define OMAP_I2C_WE_DRDY_WE (1 << 3) /* TX/RX data ready wakeup */
+#define OMAP_I2C_WE_ARDY_WE (1 << 2) /* Reg access ready wakeup */
+#define OMAP_I2C_WE_NACK_WE (1 << 1) /* No acknowledgment wakeup */
+#define OMAP_I2C_WE_AL_WE (1 << 0) /* Arbitration lost wakeup */
+
+#define OMAP_I2C_WE_ALL (OMAP_I2C_WE_XDR_WE | OMAP_I2C_WE_RDR_WE | \
+ OMAP_I2C_WE_AAS_WE | OMAP_I2C_WE_BF_WE | \
+ OMAP_I2C_WE_STC_WE | OMAP_I2C_WE_GC_WE | \
+ OMAP_I2C_WE_DRDY_WE | OMAP_I2C_WE_ARDY_WE | \
+ OMAP_I2C_WE_NACK_WE | OMAP_I2C_WE_AL_WE)
+
/* I2C Buffer Configuration Register (OMAP_I2C_BUF): */
#define OMAP_I2C_BUF_RDMA_EN (1 << 15) /* RX DMA channel enable */
#define OMAP_I2C_BUF_RXFIF_CLR (1 << 14) /* RX FIFO Clear */
#define OMAP_I2C_SYSTEST_SDA_O (1 << 0) /* SDA line drive out */
#endif
-/* I2C System Status register (OMAP_I2C_SYSS): */
-#define OMAP_I2C_SYSS_RDONE (1 << 0) /* Reset Done */
+/* OCP_SYSSTATUS bit definitions */
+#define SYSS_RESETDONE_MASK (1 << 0)
+
+/* OCP_SYSCONFIG bit definitions */
+#define SYSC_CLOCKACTIVITY_MASK (0x3 << 8)
+#define SYSC_SIDLEMODE_MASK (0x3 << 3)
+#define SYSC_ENAWAKEUP_MASK (1 << 2)
+#define SYSC_SOFTRESET_MASK (1 << 1)
+#define SYSC_AUTOIDLE_MASK (1 << 0)
+
+#define SYSC_IDLEMODE_SMART 0x2
+#define SYSC_CLOCKACTIVITY_FCLK 0x2
-/* I2C System Configuration Register (OMAP_I2C_SYSC): */
-#define OMAP_I2C_SYSC_SRST (1 << 1) /* Soft Reset */
struct omap_i2c_dev {
struct device *dev;
* fifo_size==0 implies no fifo
* if set, should be trsh+1
*/
- unsigned rev1:1;
+ u8 rev;
unsigned b_hw:1; /* bad h/w fixes */
unsigned idle:1;
u16 iestate; /* Saved interrupt register */
static void omap_i2c_unidle(struct omap_i2c_dev *dev)
{
+ WARN_ON(!dev->idle);
+
if (dev->iclk != NULL)
clk_enable(dev->iclk);
clk_enable(dev->fclk);
{
u16 iv;
+ WARN_ON(dev->idle);
+
dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0);
- if (dev->rev1) {
- iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); /* Read clears */
+ if (dev->rev < OMAP_I2C_REV_2) {
+ iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); /* Read clears */
} else {
omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, dev->iestate);
unsigned long timeout;
unsigned long internal_clk = 0;
- if (!dev->rev1) {
- omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, OMAP_I2C_SYSC_SRST);
+ if (dev->rev >= OMAP_I2C_REV_2) {
+ omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, SYSC_SOFTRESET_MASK);
/* For some reason we need to set the EN bit before the
* reset done bit gets set. */
timeout = jiffies + OMAP_I2C_TIMEOUT;
omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
while (!(omap_i2c_read_reg(dev, OMAP_I2C_SYSS_REG) &
- OMAP_I2C_SYSS_RDONE)) {
+ SYSS_RESETDONE_MASK)) {
if (time_after(jiffies, timeout)) {
dev_warn(dev->dev, "timeout waiting "
"for controller reset\n");
}
msleep(1);
}
+
+ /* SYSC register is cleared by the reset; rewrite it */
+ if (dev->rev == OMAP_I2C_REV_ON_2430) {
+
+ omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG,
+ SYSC_AUTOIDLE_MASK);
+
+ } else if (dev->rev >= OMAP_I2C_REV_ON_3430) {
+ u32 v;
+
+ v = SYSC_AUTOIDLE_MASK;
+ v |= SYSC_ENAWAKEUP_MASK;
+ v |= (SYSC_IDLEMODE_SMART <<
+ __ffs(SYSC_SIDLEMODE_MASK));
+ v |= (SYSC_CLOCKACTIVITY_FCLK <<
+ __ffs(SYSC_CLOCKACTIVITY_MASK));
+
+ omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, v);
+ /*
+ * Enabling all wakup sources to stop I2C freezing on
+ * WFI instruction.
+ * REVISIT: Some wkup sources might not be needed.
+ */
+ omap_i2c_write_reg(dev, OMAP_I2C_WE_REG,
+ OMAP_I2C_WE_ALL);
+
+ }
}
omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
/* Enable interrupts */
omap_i2c_write_reg(dev, OMAP_I2C_IE_REG,
- (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY |
- OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK |
- OMAP_I2C_IE_AL) | ((dev->fifo_size) ?
+ (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY |
+ OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK |
+ OMAP_I2C_IE_AL) | ((dev->fifo_size) ?
(OMAP_I2C_IE_RDR | OMAP_I2C_IE_XDR) : 0));
return 0;
}
w |= OMAP_I2C_CON_XA;
if (!(msg->flags & I2C_M_RD))
w |= OMAP_I2C_CON_TRX;
+
if (!dev->b_hw && stop)
w |= OMAP_I2C_CON_STP;
+
omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
/*
omap_i2c_unidle(dev);
- if ((r = omap_i2c_wait_for_bb(dev)) < 0)
+ r = omap_i2c_wait_for_bb(dev);
+ if (r < 0)
goto out;
for (i = 0; i < num; i++) {
omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat);
}
+/* rev1 devices are apparently only on some 15xx */
+#ifdef CONFIG_ARCH_OMAP15XX
+
static irqreturn_t
omap_i2c_rev1_isr(int this_irq, void *dev_id)
{
return IRQ_HANDLED;
}
+#else
+#define omap_i2c_rev1_isr NULL
+#endif
static irqreturn_t
omap_i2c_isr(int this_irq, void *dev_id)
if (stat & OMAP_I2C_STAT_RRDY)
num_bytes = dev->fifo_size;
else
- num_bytes = omap_i2c_read_reg(dev,
- OMAP_I2C_BUFSTAT_REG);
+ num_bytes = (omap_i2c_read_reg(dev,
+ OMAP_I2C_BUFSTAT_REG)
+ >> 8) & 0x3F;
}
while (num_bytes) {
num_bytes--;
if (stat & OMAP_I2C_STAT_XRDY)
num_bytes = dev->fifo_size;
else
- num_bytes = omap_i2c_read_reg(dev,
- OMAP_I2C_BUFSTAT_REG);
+ num_bytes = (omap_i2c_read_reg(dev,
+ OMAP_I2C_BUFSTAT_REG))
+ & 0x3F;
}
while (num_bytes) {
num_bytes--;
struct omap_i2c_dev *dev;
struct i2c_adapter *adap;
struct resource *mem, *irq, *ioarea;
+ void *isr;
int r;
u32 speed = 0;
speed = 100; /* Defualt speed */
dev->speed = speed;
+ dev->idle = 1;
dev->dev = &pdev->dev;
dev->irq = irq->start;
dev->base = ioremap(mem->start, mem->end - mem->start + 1);
omap_i2c_unidle(dev);
- if (cpu_is_omap15xx())
- dev->rev1 = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) < 0x20;
+ dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff;
if (cpu_is_omap2430() || cpu_is_omap34xx()) {
u16 s;
/* reset ASAP, clearing any IRQs */
omap_i2c_init(dev);
- r = request_irq(dev->irq, dev->rev1 ? omap_i2c_rev1_isr : omap_i2c_isr,
- 0, pdev->name, dev);
+ isr = (dev->rev < OMAP_I2C_REV_2) ? omap_i2c_rev1_isr : omap_i2c_isr;
+ r = request_irq(dev->irq, isr, 0, pdev->name, dev);
if (r) {
dev_err(dev->dev, "failure requesting irq %i\n", dev->irq);
goto err_unuse_clocks;
}
- r = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff;
+
dev_info(dev->dev, "bus %d rev%d.%d at %d kHz\n",
- pdev->id, r >> 4, r & 0xf, dev->speed);
+ pdev->id, dev->rev >> 4, dev->rev & 0xf, dev->speed);
+
+ omap_i2c_idle(dev);
adap = &dev->adapter;
i2c_set_adapdata(adap, dev);
goto err_free_irq;
}
- omap_i2c_idle(dev);
-
return 0;
err_free_irq:
projects / linux-2.6-omap-h63xx.git / blobdiff